By heavy I meant truly heavy, above 110 KG :- ) Originally, X2 had 300 PSI limit but because the air cans kept exploding off, it was revised back to 250 PSI (That is what I ran with DPX2 on Capra with my 90kgs, and that bike has 70perc. progression! 3 times any Specialized bike). Then 2021 had some upgrade and I think it might be 300 PSI again but the design is ultimately quite similar. Whereas DPS/DPX2 can go up to 350 PSI without issue in all their revisions.
I also plan to put X2 on Levo SL for my wife eventually, it's just that their price in Europe is absolutely abysmal (900 Euro), might as well buy Storia EXT.. The shock might be too linear for LevoSL without something like the Cascade Link.
If you already have X2, I would not get rid of it. There is definitely a setup/tune out there for you, it's the most tunable air-shock out there, it just might take some time to figure out. Definitely get Quark, it's like 200 bucks discounted in many places and it's very useful for shocks that have separate damping circuits and offer 4-way tunability.